Yazar "Temiz, Mefhar Gultekin" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • [ X ]
    Öğe
    cis-Jasmone treatments affect multiple sucking insect pests and associated predators in cotton
    (E Schweizerbartsche Verlagsbuchhandlung, 2020) Tonga, Adil; Cakmak, Suna; Seker, Kadri; Temiz, Mefhar Gultekin; Bayram, Ahmet
    Defense induction by exogenous applications of natural plant defense elicitors is an alternative pest control method. Such deployments not only provide resistance against herbivores but also attract their natural enemies. The influences of different doses of the plant defense elicitor cis-jasmone (CJ) (25, 50, 100 g/ha and an untreated control) on cooccurring sucking cotton, Gossypium hirsutum Linnaeus, insect pests from different feeding guilds (Thrips tabaci, Aphis gossypii, Empoasca decipiens) and their predators (Aeolothrips intetmedius, Chrysoperla carnea, Coccinella septempunctata) were examined under field conditions in 2012 and 2013. CJ treatments, coinciding with different plant growth stages, were made per growing season. The abundance of apterous A. gossypii was lower on CJ-sprayed cotton plants than on untreated control plants. Similarly, the overall abundance of T. tabaci was lower on treated cotton plants irrespective of the tested dose comparing with untreated control plants. Empoasca decipiens abundance was lowest on plants treated with the lowest CJ dose (25 g/ha). An attractive effect of CJ treatments on the predatory thrips A. intermedius was detected; its highest abundances were recorded on plants treated with 100 g/ha CJ. The highest abundances of C. carnea were detected on plants treated with 100 g/h CJ in 2012, whereas no such dose-specific attraction was recorded in 2013. CJ treatments had no significant effect on C. septempunctata and alate A. gossypii abundances. The different CJ doses used had no phytotoxic effects on cotton plants and cotton yield. The results are discussed in terms of possible CJ deployment in cotton pest management.
  • [ X ]
    Öğe
    THE EFFECT OF APPLICATION OF PHYTOTOXIC LEVELS OF BORON ALONG WITH SULPHUR ON NUTRIENT CONTENT IN COTTON (Gossypium hirsutum L.)
    (Univ Agronomic Sciences & Veterinary Medicine Bucharest - Usamv, 2017) Kurt, Firat; Temiz, Mefhar Gultekin
    This study was carried out determining the effect of phytotoxic boron along with sulphur fertilizers on nutrient content in cotton in the research field of the department of field crops at Dicle University between 2013 and 2014. In the trial designed in randomized complete split block, the effect of two sulphur doses (0-100 kg da(-1)) and four boron doses ( 0, 2.5, 5 and 15 mg kg(-1)) on nutrient concentrations of cotton leaves were examined. According to the results, 5 and 15 mg kg(-1) of B treatments with and without sulphur did not cause any visible toxic symptoms in cotton. Moreover, the treatments resulted in uptake of N, P, K, Fe, Zn and Mn nutrients in sufficiency ranges whereas Ca, S, Mg, Cu and Mo concentrations were lower than required concentration ranges of these nutrients. B content of leaves was found in sufficient range in plots where phytotoxic level of B was used. The effect of S application over N, K, Ca, B, Mn and Mo content of leaves showed decrease of these nutrients' concentrations but an increase the concentrations of S, Mg, Fe, Zn and Cu. In addition to this, the content of Mo was the lowest among nutrients. In terms of B and S interaction, P concentrations showed inconsistent results during the study.
  • [ X ]
    Öğe
    Improving Cotton Yield, Water Use and Net Income in Different Drip Irrigation Systems Using Real-Time Crop Evapotranspiration
    (Hard, 2021) cetin, Oner; Uzen, Nese; Temiz, Mefhar Gultekin; Altunten, Hilal
    The purpose of this study was to improve irrigation water use and cotton yield using real-time crop evepotranspiration based on the FAO-56 Penman-Monteith and canopy cover using surface drip and subsurface drip irrigation. The experiments were conducted Southeast Anatolia Region of Turkey, during 2016 and 2017. The experimental design was split-plots in randomized blocks using three replications. The main plots were surface drip irrigation (SDI), subsurface drip irrigation (SSDI-30 cm) and SSDI-40 cm. Sub-plots were three different irrigation levels based on real crop evapotranspiration (ETc), 0.75xETc, 1.00xETc and 1.25x ETc. There were significant differences (657 kg ha(-1)) between the seed cotton yield of SDI (3667 kg ha(-1)) and SSDI with a 40-cm lateral depth (4323 kg ha(-1)). Irrigation water and crop consumptive water use were 552 and 589 mm for the SSDI-40 cm recommended treatment, respectively. According to the projection using the results for cotton cultivation area in the study region, SDI and SSDI could save water about 37 and 42% compared to furrow irrigation, respectively. Net income based on unit area in SDI and SSDI was higher 20 and 69% than it in furrow irrigation, respectively. Irrigation scheduling based on real crop evapotranspiration (1.0xETc) was more appropriate for water saving and increasing water productivity (0.84 kg m(-3)). The use of drip irrigation systems (especially SSDI) is significantly important to improve cotton yield, water use and economic contribution considering possible water shortage, decreasing water resources, farmers conditions, irrigation schemes, regional and national incomes.